Optical design of athermalised dual field of view zoom lens in long wave infrared (8μm - 12μm) spectral band using benefits of paraxial optics

2016 ◽  
Author(s):  
Doruk Kucukcelebi
Keyword(s):  
Optical Design ◽  
Spectral Band ◽  
Field Of View ◽  
Zoom Lens ◽  
Long Wave ◽  
Long Wave Infrared

scholarly journals Optical design, laboratory test, and calibration of airborne long wave infrared imaging spectrometer

2017 ◽  
Vol 25 (19) ◽  
pp. 22440 ◽  
Author(s):  
Liyin Yuan ◽  
Zhiping He ◽  
Gang Lv ◽  
Yueming Wang ◽  
Chunlai Li ◽  
...  
Keyword(s):  
Laboratory Test ◽  
Infrared Imaging ◽  
Optical Design ◽  
Imaging Spectrometer ◽  
Long Wave ◽  
Long Wave Infrared

Infrared Imaging Fourier Transform Spectrometer as the Stand-Off Gas Detection System

2011 ◽  
Vol 18 (4) ◽  
pp. 607-620 ◽  
Author(s):  
Mariusz Kastek ◽  
Tadeusz Piątkowski ◽  
Piotr Trzaskawka
Keyword(s):  
Fourier Transform ◽  
Infrared Imaging ◽  
Detection System ◽  
Reference Signal ◽  
Field Of View ◽  
Gas Detection ◽  
Fourier Transform Spectrometer ◽  
Theoretical Evaluation ◽  
Long Wave ◽  
Long Wave Infrared

Infrared Imaging Fourier Transform Spectrometer as the Stand-Off Gas Detection SystemThe article presents the detection of gases using an infrared imaging Fourier-transform spectrometer (IFTS). The Telops company has developed the IFTS instrumentHyperCam, which is offered as a short- or long-wave infrared device. The principle ofHyperCamoperation and methodology of gas detection has been shown in the paper, as well as theoretical evaluation of gas detection possibility. Calculations of the optical path between the IFTS device, cloud of gases and background have been also discussed. The variation of a signal reaching the IFTS caused by the presence of a gas has been calculated and compared with the reference signal obtained without the presence of a gas in IFTS's field of view. Verification of the theoretical result has been made by laboratory measurements. Some results of the detection of various types of gases has been also included in the paper.

scholarly journals Broadband lightweight flat lenses for long-wave infrared imaging

2019 ◽  
Vol 116 (43) ◽  
pp. 21375-21378 ◽  
Author(s):  
Monjurul Meem ◽  
Sourangsu Banerji ◽  
Apratim Majumder ◽  
Fernando Guevara Vasquez ◽  
Berardi Sensale-Rodriguez ◽  
...  
Keyword(s):  
Infrared Imaging ◽  
Spectral Band ◽  
Image Sensors ◽  
Drastic Reduction ◽  
Long Wave ◽  
Good Imaging ◽  
Chromatic Aberrations ◽  
Flat Lens ◽  
Long Wave Infrared ◽  
Quality Imaging

We experimentally demonstrate imaging in the long-wave infrared (LWIR) spectral band (8 μm to 12 μm) using a single polymer flat lens based upon multilevel diffractive optics. The device thickness is only 10 μm, and chromatic aberrations are corrected over the entire LWIR band with one surface. Due to the drastic reduction in device thickness, we are able to utilize polymers with absorption in the LWIR, allowing for inexpensive manufacturing via imprint lithography. The weight of our lens is less than 100 times those of comparable refractive lenses. We fabricated and characterized 2 different flat lenses. Even with about 25% absorption losses, experiments show that our flat polymer lenses obtain good imaging with field of view of 35° and angular resolution less than 0.013°. The flat lenses were characterized with 2 different commercial LWIR image sensors. Finally, we show that, by using lossless, higher-refractive-index materials like silicon, focusing efficiencies in excess of 70% can be achieved over the entire LWIR band. Our results firmly establish the potential for lightweight, ultrathin, broadband lenses for high-quality imaging in the LWIR band.

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